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selftests/bpf: check if imprecise stack spills confuse infinite loop detection

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Verify that infinite loop detection logic separates states with
identical register states but different imprecise scalars spilled to
stack.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20240108205209.838365-4-maxtram95@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2024-01-08 22:51:57 +02:00 committed by Alexei Starovoitov
parent d5b892fd60
commit c035b3e555
1 changed files with 24 additions and 0 deletions
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24
tools/testing/selftests/bpf/progs/verifier_loops1.c
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@ -259,4 +259,28 @@ l0_%=: r2 += r1; \
" ::: __clobber_all);
}
SEC("xdp")
__success
__naked void not_an_inifinite_loop(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r0 &= 0xff; \
*(u64 *)(r10 - 8) = r0; \
r0 = 0; \
loop_%=: \
r0 = *(u64 *)(r10 - 8); \
if r0 > 10 goto exit_%=; \
r0 += 1; \
*(u64 *)(r10 - 8) = r0; \
r0 = 0; \
goto loop_%=; \
exit_%=: \
r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";